Adjustable bow cable tensioner.

ABSTRACT

A bow tensioner that applies an adjustable pre-loaded tension to the bow cables when the bow string is drawn back. When the bow string is released the added tension to the bow cables creates more force to the bow string which increases the force and thrust of the arrow resulting greater speed, accuracy and range.

REFERENCE TO RELATED APPLICATIONS

This application claims priority to Provisional Patent Application Serial Number entitled U.S. 61/198,444 and filed on Nov. 6, 2008 which is fully incorporated herein by reference.

BACKGROUND

The present invention relates to compound bows. More particularly, the present invention relates to a compound bow string/cable tensioner that applies an adjustable pre-loaded tension to the compound bow cables when the bow draw string is drawn back. When the bow string is released the added tension to the bow cables creates more force to the bow string which increases the force and thrust of the arrow resulting greater speed, accuracy and range.

DESCRIPTION OF THE PROBLEM

In a compound bow when the bow string is drawn back it rotates cams attached to either one or both limbs of the compound bow and the bow cable is drawn onto the cam. As the bow cables are drawn onto the cam the vertical position of the bow cables move towards the back of the compound bow and away from the riser. The bow cables pass through a cable slide attached to a horizontal rod that allows the cable slide to move along a horizontal plane to follow the movement of the cables.

When the bow string is released, the bow cables pull the cams they have been drawn onto causing them to rotate and apply additional force to the bow string.

Because the bow cable is allowed to move freely towards the rear of the bow, some of the tension caused by the bow cable being drawn onto the cams is lost.

SUMMARY OF INVENTION

This invention is mounted in such a manner that it can be adjusted and secured along a plane that is horizontal to the bow string or cable. It most often replaces the original cable slide or other device that holds or guides the bow strings or cables.

FIG. 3 (10))

The device has two grooved pulleys, wheels or rollers (FIG. 1(4)) that are mounted on it in such a manner that the bow cables or strings pass over the pulleys, wheels or rollers so that the bow strings or cables can be guided and restrained as the bow string is drawn back.

Because the device's position can be changed along its plane of travel and locked in position, (FIG. 1 (2)) as the bow string is drawn, drawing the bow cables onto their cams, the natural tendency of the bow cables to move toward the rear of the bow is restricted by the device causing the bow cables to be deflected into an arc and so effectively shortening them and applying more tension to the bow limbs.

When the bow string is release, the additional tension applied to the bow limbs by the bow cables is translated by a cam system into more force or thrust being applied to the bow draw string. The bow draw string applies the additional force or thrust to the arrow increasing its speed, accuracy and range.

The difference between this device and prior art that uses a standard cable guide is that the standard cable guide does not restrict the movement of the cables away from the front of the bow as the bow is drawn. The difference between this device and prior art that also uses pulleys, rollers or wheels to secure and guide the bow cables or strings is that the position of these devices in relation to their distance from the front of the bow is permanently fixed, whereas the present invention's position in relation to it's distance from the front of the bow is easily changed. The ability to change the present inventions position allows the user to set the pre-loaded tension of the cables to suit the customization on their particular bow so that the maximum effect of the present inventions ability to pre-load the cables or strings is achieved resulting in the greatest possible increase in the speed of the arrow.

DETAILED DESCRIPTION

The various embodiments of the present invention are best understood by referring to FIGS. 1 through 7 of the drawings.

The elements of the drawings are not to scale and like numbering is used in each of the drawings.

This invention may be provided in other specific forms and embodiments without departing from the essential characteristics described herein. The embodiments described are to be considered in all aspects to be illustrative only and not restrictive in any manner.

As described above and shown in the associated drawings, the present invention is an adjustable mechanism to apply a variable load to the string or cable on a compound bow in order to increase the thrust of the string or cable to impart more force on the shaft of the arrow and increase it's velocity.

While [particular embodiments of the invention have been described, it is understood that the invention is not limited thereto, since modifications and improvements may be made by those skilled in the art. It is, therefore, contemplated by the appended claims to cover any such modifications that incorporate those improvements that embody the spirit and scope of the present invention.

Referring to FIGS. 1 through 7 it can be seen that the preferred embodiment of the invention consists of a body 1 that supports a shaft 2 upon which two pulleys, wheels or rollers 4 are mounted. Applicants preferred embodiment is that the body 1 contains a shaft 3 to allow it to be mounted on a standard ⅜″ cable rod found on most compound bows. There may be other embodiments in which the body 1 is modified to suit compound bows that may require different methods of mounting the present invention.

Referring to FIG. 7 the mounting position of the present invention 10 on the compound bow can be seen. FIG. 7 shows the present invention mounted on a compound bow that has a standard cable rod 9. Other compound bows, both in the present and those that may be developed in the future, may or do not have a cable rod 9 in which case the Body 1 referred to in FIGS. 1 through 7 may be altered to have other embodiments to allow it to be mounted in such a manner that it is easily adjusted to set the load on the cable or strings by moving the present invention towards the riser 11 or the draw string 7.

Referring to FIG. 7 when the draw string or cable 7 is drawn the strings or cables 8 move away from the riser 11 towards the rear of the compound bow. When the present invention is mounted on the bow the movement of the strings or cables 8 away from the riser 11 is prevented. In preventing the strings or cables 8 from moving away from the riser 11 an additional load is transferred to the bow limbs 12 in such a way that when the draw string or cable 7 is released, the additional load is converted to additional force or thrust through the draw cycle as the draw string or cable 7 moves towards the riser 11 driving the arrow away from the bow.

DRAWINGS—FIG. 1 THROUGH FIG. 7

FIG. 1

Bottom View of Invention showing wheels/Pulleys, spacers, securing screws, safety leg, shaft and carbon rod.

1) Body

2) Securing Screws

3) Shaft

4) Grooved Pulley

5) Spacer

6) Circlip

9) Carbon Rod

13) Safety leg

FIG. 2

Left hand side view of invention showing retaining circlep, wheels/pulleys in relation to the body.

1) Body

2) Securing Screws

3) Shaft

4) Grooved Pulley

6) Circlip

9) Carbon Rod

13 Safety leg

FIG. 3

3D back view of invention.

1) Body

2) Securing screw

3) Shaft

4) Grooved pulley

6) Circlip

9) Carbon rod

13) Safety leg

FIG. 4

3D Front view of invention.

1) Body

2) Securing screws

3) Shaft

4) Grooved pulleys

6) Circlip

9) Carbon rod

13) Safety leg

FIG. 5

Back view of invention.

1) Body

3) Shaft

4) Grooved Pulley

9) Carbon rod

FIG. 6

Cross section of invention.

1) Body

2) Securing screw

3) Shaft

4) Grooved pulley

5) Spacer

6) Circlip

9) Carbon rod

13) Safety leg

FIG. 7

Showing side view of compound with invention 10 mounted on cable rod 9.

7) Bow Draw String or cable

8) Bow String or Cable

9) Carbon rod

10) Present invention

11) Riser

12) Limb 

1. A device that when fitted to a bow restrains the bow cables or strings in such a manner that additional force is realized when the bow draw string or cable is released causing that force to be transferred to the arrow as thrust causing the arrow to leave the bow at a higher speed than it would without the device.
 2. That this device differs from all other such other devices in that the amount of restraint applied to the bow strings or cables can be adjusted to achieve the maximum amount of additional thrust through the draw cycle. That this is an important and desirable feature as even bows of the same model and manufacture perform differently due to changes in settings and other customization by the end user of the bow.
 3. This device comprises: a. A body 1 that supports two grooved pulleys, wheels or rollers. 4 b. Two grooved pulleys, wheels or rollers. 4 c. A shaft 3 attached to the body on which the grooved pulleys, wheels or rollers are mounted. d. A safety leg 13 to prevent the bow strings leaving the pulleys 4 A method of securing the device to the bow in such a manner that it is easily moved along a plane that moves it either closer or further from the riser to allow the restraint on the bow cables or strings to be adjusted to achieve the maximum possible thrust when the draw string of the bow is released. 